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CVE-2026-52936

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: crypto: jitterentropy - replace long-held spinlock with mutex jent_kcapi_random() serializes the shared jitterentropy state, bu…

Published Jun 24, 2026EPSS 0.11%

Overview

CVE-2026-52936 is a medium-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

crypto: jitterentropy - replace long-held spinlock with mutex

jent_kcapi_random() serializes the shared jitterentropy state, but it

currently holds a spinlock across the jent_read_entropy() call. That

path performs expensive jitter collection and SHA3 conditioning, so

parallel readers can trigger stalls as contending waiters spin for

the same lock.

To prevent non-preemptible lock hold, replace rng->jent_lock with a

mutex so contended readers sleep instead of spinning on a shared lock

held across expensive entropy generation.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351Refgit.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4Refgit.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4Refgit.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02Refgit.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52936?

CVE-2026-52936 is a medium-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-52936?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-52936?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-52936?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52936 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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